F3-12800CL9Q-8GBZL (2Gx4) + M5A99x evo + AMD FX-8350

[pierrerock]

Hi, i just bought a new custom computer on newegg and everything seems to work perfectly, but sometimes my computer makes a BSOD. i went in the UEFI BIOS and checked for the DRAM timing which was in auto mode at 11-11-11-28. So i changed it to 9-9-9-24 but there are many more setting on UEFI than i ever seen and the system keep unstable. i wish you could help me. here are the settings;

DRAM CAS# latency CHA:9 CHB:9 (9)
DRAM RAS# to CAS# Delay CHA:9 CHB:9 (9)
DRAM RAS# Pre time CHA: 9 CHB:9 (9)
DRAM RAS# ACT Time CHA: 24 CHB:24 (24)
DRAM READ to PRE time CHA:6 CHB:6 (AUTO)
DRAM RAS# to RAS# CHA:5 CHB:5 (AUTO)
DRAM WRITE to READ CHA:6 CHB:6 (AUTO)
DRAM CAS# write latency CHA:8 CHB:8 (AUTO)
DRAM WRITE recovery time CHA:12 CHB:12 (AUTO)
DRAM REF cycle time 110ns (AUTO)
DRAM Row cycle time CHA:39 CHB:39 (AUTO)
DRAM READ to WRITE delay CHA:6 CHB:6 (AUTO)
DRAM WRITE to READ delay (DD) CHA:3 CHB:3 (AUTO)
DRAM WRITE to WRITE timing CHA:4 CHB:4 (AUTO)
DRAM READ to READ timing CHA:4 CHB:4 (AUTO)
DRAM refresh rate: every 7.8ms (AUTO)
DRAM command Rate: 2T (AUTO)

all four dimms are from the same package, i apologize if my english isn't perfect. My primary language is french

[Tradesman]

Try raising the CPU/NB + 0.08

[pierrerock]

Try raising the CPU/NB + 0.08

it worked but i was working in a solidworks assembly composed of about 100 parts and my computer did a BSOD after 4 hours. after i tried to reboot the computer but it keep doing BSODs when starting

[Tradesman]

Do you have the latest BIOS?

[pierrerock]

yes i have the last BIOS 1604 on windows 7 SP1. and i don't know if it can matter, but I installed a corsair H100i cooling system.

[Tradesman]

Try raising the DRAM REF cycle time to the next level, think it will be about 160

[pierrerock]

it changed nothing. the computer crashed after 3 hour of work

[Tradesman]

Let's take CPU/NB voltage to 1.35 and DRAM voltage up to 1.55, then if that is stable, lower the CPU/NB maybe 0.02 at a shot while maintaining stability...when problems arise again, take back up 0.02 and leave there

[pierrerock]

ok ! thank you very much I will tell you if it works. i very appreciate your help

[Tradesman]

No problem, drop us an update

[pierrerock]

hello again ! classes are finaly over and i found some time to try the solution you provided me. it appear that the computer is still crashing even with CPU/NB at 1.35 V. but it took something like 3 hours before crashing and it crashed while gaming. i updated the CPU driver but the computers keep making blue screen about the memory management

[Tradesman]

All right, let's leave CPU/NB as is and raise the DRAM voltage to 1.6 and add + 0.06 to the vCore (CPU voltage)

[pierrerock]

it didnt work... but im wondering why this always take so much time before crashing

[Tradesman]

Let's try something a little different - leave the rest as is and change

DRAM READ to PRE time CHA:6 CHB:6 (AUTO) to 7
DRAM RAS# to RAS# CHA:5 CHB:5 (AUTO) to 6
DRAM WRITE to READ CHA:6 CHB:6 (AUTO) to 7

and CPU/NB up another + 0.04

[pierrerock]

the computer is now freezing when i try to open multiple applications